// This file is part of OpenTSDB.
// Copyright (C) 2010-2012  The OpenTSDB Authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 2.1 of the License, or (at your
// option) any later version.  This program is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
// General Public License for more details.  You should have received a copy
// of the GNU Lesser General Public License along with this program.  If not,
// see <http://www.gnu.org/licenses/>.
package net.opentsdb.core;

/**
 * Constants used in various places.
 */
public final class Const {

    /**
     * Number of bytes on which a timestamp is encoded.
     */
    public static final short TIMESTAMP_BYTES = 4;

    /**
     * Maximum number of tags allowed per data point.
     */
    public static final short MAX_NUM_TAGS = 8;
    // 8 is an aggressive limit on purpose.  Can always be increased later.

    /**
     * Number of LSBs in time_deltas reserved for flags.
     */
    static final short FLAG_BITS = 4;

    /**
     * When this bit is set, the value is a floating point value.
     * Otherwise it's an integer value.
     */
    static final short FLAG_FLOAT = 0x8;

    /**
     * Mask to select the size of a value from the qualifier.
     */
    static final short LENGTH_MASK = 0x7;

    /**
     * Mask to select all the FLAG_BITS.
     */
    static final short FLAGS_MASK = FLAG_FLOAT | LENGTH_MASK;

    /**
     * Max time delta (in seconds) we can store in a column qualifier.
     */
    public static final short MAX_TIMESPAN = 3600;

    /**
     * Array containing the hexadecimal characters (0 to 9, A to F).
     * This array is read-only, changing its contents leads to an undefined
     * behavior.
     */
    public static final byte[] HEX = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'A', 'B', 'C', 'D', 'E', 'F'
    };

    public static void main(String[] args){
        System.out.println(0x00000000FFFFFFFF);
    }

}
